Manifold absolute pressure is usually indicated in inches of mercury.

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Manifold absolute pressure is usually indicated in inches of mercury.

Explanation:
MAP is the absolute pressure inside the intake manifold. In aviation practice, this pressure is most commonly shown in inches of mercury because vacuum/pressure gauges historically used a mercury column and the inch-of-mercury unit became the standard. At sea level, standard atmospheric pressure is about 29.92 inHg, so with the throttle wide open the manifold pressure approaches that value; as the throttle closes, the engine creates a vacuum and MAP falls below 29.92 inHg. While other units like kilopascals, bars, or psi exist and may appear on some modern displays, inches of mercury is the traditional and widely used indication for manifold absolute pressure.

MAP is the absolute pressure inside the intake manifold. In aviation practice, this pressure is most commonly shown in inches of mercury because vacuum/pressure gauges historically used a mercury column and the inch-of-mercury unit became the standard. At sea level, standard atmospheric pressure is about 29.92 inHg, so with the throttle wide open the manifold pressure approaches that value; as the throttle closes, the engine creates a vacuum and MAP falls below 29.92 inHg. While other units like kilopascals, bars, or psi exist and may appear on some modern displays, inches of mercury is the traditional and widely used indication for manifold absolute pressure.

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